package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


@Slf4j
@Aspect
@Component
public class AutoFillApect {

    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){};

    @Before("autoFillPointCut()")
    public void autoFillBefore(JoinPoint joinPoint){
        log.info("开始进行公共字段的自动填充");

        //获取当前被拦截的方法
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取当前员工实体
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        //准备赋值数据和值
        LocalDateTime now = LocalDateTime.now();
        Long currentid = BaseContext.getCurrentId();
        //根据当前不同方法为不同属性值进行赋值
        if(operationType == OperationType.INSERT) {
            //为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentid);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentid);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        else if(operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentid);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
